Every Latter-day Saint who has ever felt genuine joy during a fast knows something that economics has only recently named. Giving up a meal, contributing the cost to someone in need, and feeling enlarged by the exchange is an experience that defies the standard model of human motivation. Standard economic theory predicts that people act to maximize their own immediate benefit. The person who fasts and gives with a full heart is doing something else entirely. They are discovering what researcher Tatsuyoshi Saijo calls futurability: the innate human capacity to find real satisfaction in acting for the benefit of others across time.